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Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of available-for-sale securities
The following tables summarize available-for-sale debt securities held by the Company at June 30, 2022 and December 31, 2021:
Available-for-Sale Debt Securities
June 30, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$191,051 $0 $16,949 $174,102 
Obligations of U.S. Government sponsored entities863,235 36 69,778 793,493 
Obligations of U.S. states and political subdivisions95,661 54 7,637 88,078 
Mortgage-backed securities – residential, issued by
 U.S. Government agencies63,185 38 4,109 59,114 
 U.S. Government sponsored entities859,388 18 84,835 774,571 
U.S. corporate debt securities2,500 0 140 2,360 
Total available-for-sale debt securities$2,075,020 $146 $183,448 $1,891,718 
 
Available-for-Sale Debt Securities
December 31, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$160,291 $85 $2,542 $157,834 
Obligations of U.S. Government sponsored entities843,218 4,527 15,372 832,373 
Obligations of U.S. states and political subdivisions102,177 2,092 100 104,169 
Mortgage-backed securities – residential, issued by
U.S. Government agencies76,502 1,187 532 77,157 
U.S. Government sponsored entities879,102 5,735 14,281 870,556 
U.S. corporate debt securities2,500 0 76 2,424 
Total available-for-sale debt securities$2,063,790 $13,626 $32,903 $2,044,513 
Schedule of held-to-maturity securities
The following tables summarize held-to-maturity debt securities held by the Company at June 30, 2022 and December 31, 2021:

Held-to-Maturity Securities
June 30, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$86,582 $0 $9,237 $77,345 
Obligations of U.S. Government sponsored entities225,733 0 28,418 197,315 
Total held-to-maturity debt securities$312,315 $0 $37,655 $274,660 

Held-to-Maturity Securities
December 31, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$86,689 $279 $600 $86,368 
Obligations of U.S. Government sponsored entities197,320 389 1,789 195,920 
Total held-to-maturity debt securities$284,009 $668 $2,389 $282,288 
Schedule of available-for-sale securities with unrealized losses
The following table summarizes available-for-sale debt securities that had unrealized losses at June 30, 2022, and December 31, 2021:

June 30, 2022Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$169,550 $16,547 $4,552 $402 $174,102 $16,949 
Obligations of U.S. Government sponsored entities353,414 23,720 411,422 46,058 764,836 69,778 
Obligations of U.S. states and political subdivisions71,476 6,901 3,123 736 74,599 7,637 
Mortgage-backed securities – residential, issued by
U.S. Government agencies36,509 1,299 21,389 2,810 57,898 4,109 
U.S. Government sponsored entities520,389 35,937 250,441 48,898 770,830 84,835 
U.S. corporate debt securities0 0 2,360 140 2,360 140 
Total available-for-sale debt securities$1,151,338 $84,404 $693,287 $99,044 $1,844,625 $183,448 
December 31, 2021Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$147,810 $2,542 $0 $0 $147,810 $2,542 
Obligations of U.S. Government sponsored entities362,895 6,694 289,210 8,678 652,105 15,372 
Obligations of U.S. states and political subdivisions9,700 85 1,283 15 10,983 100 
Mortgage-backed securities – residential, issued by
U.S. Government agencies22,074 160 16,846 372 38,920 532 
U.S. Government sponsored entities553,351 11,440 84,537 2,841 637,888 14,281 
U.S. corporate debt securities0 0 2,424 76 2,424 76 
Total available-for-sale debt securities$1,095,830 $20,921 $394,300 $11,982 $1,490,130 $32,903 
Schedule held-to-maturity securities with unrealized losses
The following table summarizes held-to-maturity debt securities that had unrealized losses at June 30, 2022 and December 31, 2021:

June 30, 2022Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$77,345 $9,237 $0 $0 $77,345 $9,237 
Obligations of U.S. Government sponsored entities197,315 28,418 $0 $0 $197,315 28,418 
Total held-to-maturity debt securities$274,660 $37,655 $0 $0 $274,660 $37,655 

December 31, 2021Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$35,280 $600 $0 $0 $35,280 $600 
Obligations of U.S. Government sponsored entities84,592 1,789 0 0 84,592 1,789 
Total held-to-maturity debt securities$119,872 $2,389 $0 $0 $119,872 $2,389 
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity
June 30, 2022
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$61,909 $61,879 
Due after one year through five years534,330 503,095 
Due after five years through ten years505,724 451,324 
Due after ten years50,484 41,735 
Total1,152,447 1,058,033 
Mortgage-backed securities922,573 833,685 
Total available-for-sale debt securities$2,075,020 $1,891,718 

December 31, 2021
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$77,159 $77,892 
Due after one year through five years474,537 471,776 
Due after five years through ten years501,748 492,573 
Due after ten years54,742 54,559 
Total1,108,186 1,096,800 
Mortgage-backed securities955,604 947,713 
Total available-for-sale debt securities$2,063,790 $2,044,513 
June 30, 2022
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after five years through ten years$312,315 $274,660 
Total held-to-maturity debt securities$312,315 $274,660 

December 31, 2021
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after five years through ten years$284,009 $282,288 
Total held-to-maturity debt securities$284,009 $282,288